<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
      h1{
        background-color: aqua;
        font-size: 30px;
      }
    </style>
    <link rel = "stylesheet" href="demo09.css">
</head>
<body>
  <h1 align="center" style="color: beige">CSS 样式</h1>
  <h1>今天学习了行内样式</h1>
</body>
</html>